(a) The band structure (black solid curves) and the Berry curvature (red dotted curve) of the graphene/RbMnCl₃ heterostructure. (b) The 2D distribution of the Berry curvature in the momentum space, located primarily around the Γ point. (c) The bulk band structure of the graphene/RbMnCl₃ heterostructure with an extra hole in the supercell. (d) The bulk band gap E_g as a function of (d₀ − d)/d₀, where d is the distance between graphene and the RbMnCl₃ film and d₀ is the corresponding optimized distance. Reprinted with permission from Ref. [17]. Copyright 2015 by Nature Publication Group.